LBS only ever did a demo for Radio Sheffield, which was never aired (I remember when the demo landed on the Programme Organiser’s desk back in the days when I was working there – very exciting!!). When RS launched, it was with a themetune by Delia Derbyshire of the BBC Radiophonic Workshop (allegedly played on Sheffield cutlery!), followed by a package from Sue Manning Music. This was followed, in the mid 80s, by a custom from David Arnold, then the two K-Lite resing packages, then back to David Arnold again. Today, Radio Sheffield is airing jingles from Bespoke Music.
Where the jingle we’re discussing here is from, however, I have no idea… maybe just another demo or just a one-off cut?